Ship&#39;s-bottom paint



FIF'BEOI OR lq38l'e448 UNITEDSTATES PATENT OFFICE.

SEIJ' I ASAKAWA, OF TbKYO-FU, AND KAIGHI NOSAWA, OF CHIBA-KEN, JAPAN.

SHIPS-BOTTOM PAINT.

No Drawing.

To all whom it may concern:

Be it known that we, SEIJI AsAKAwA and KAIcHi NosAwA, subjects of the Empire of Japan, residing, respectively, at No. 452 Ohaza Minamimai, Sendagayamachi, Toyotama-Gun, Tokyo-Eu, and at No. 1016, Yahatamachi, Ichihara-Gun, Chiba-Ken, J apan, have invented a certain new and useful Improvement in Ships Bottom Paint, of which the following is a specification.

This invention relates to a ships bottom paint characterized by mixing the powdered shell of kwashi-pan (Lag (mum Deoagonuh's, a kind ofmmmghiis) into ordinary painting materials.

The object of this invention is to obtain an efficient paint for ships bottom excellent in preventing harmful marine organisms such as shell-fishes, sea-insects and sea weeds from adhering to the surface of ships bottom, and rendering more durable than any other paint now in general use.

To prepare the paint of this invention kWashi-pan collected frogn the sea is washed by water to dissolye off'a iiy assfiated salts and" is dried naturally or mechanically. he dried loiashizr rfhiis s i ecl crus With its shel ,and-fleshtossthiriaany Suitable manner. The crushed powder is then mixed with ordinary painting materials such as oils, varnishes, drying agents, coloring matters and oils, etc., and after kneading the mixture the paint hav 'ng any desired composition is obtained.

By way of examp e we propose the following proportion wl 10h give an excellent re- Powderedshello kwa p a n. l50% Varnish .42? L.:' 30% on 10% Coloring matter 10% In operation the varnish is first mixed and kneaded with the coloring matter and after Specification of Letters Patent.

Patented Aug. 16', 1921.

standing the mixture as it is for about 10 hours, the powdered shell of kwashi-pan and the oil are to be added and again kneaded well to the required grade.

The kwashi-pan is a kind of cake-urchins which is found in abundance in the waters of Japan, China, the Philippine Islands, Australia and India, etc. It is known to have detrimental effect upon the increase of useful shell-fishes and other marine life, and no available use has yet been found for it was a matter of sufferin 'for fishermen make illlalymskoS11 6%. e app icants have employed this cheap and plentiful material in the manufacture of useful paint especially fitted for ships bottom, by a simple and easy treatment. By the action of some effective ingredients contained in kwashi-pan the surface of ships bottom coated with this paint can be long maintained free from any harmful marine organisms such as shell-fishes, sea-insects and sea-weeds, and rendered more durable than any other ordinary paint.

We claim- 1. A paint for submarine use including kwashi-pan as an ingredient thereof.

2. A paint for submarine use including the powdered shell of kwashi-pan.

3. A liquid coating composition for submarine use including substantially equal nish 30%, oil 10% and coloringinatter 10%. 0 In testimony whereof we have affixed our signatures in presence of two witnesses.

SEIJ I ASAKAWA. KAICHI NOSAWA.

IVitnesses:

. E. L. MURRAY,

T. GpSMITH. I 

